International networks for knowledge sharing: lessons learnt

Today a colleague from ODI referred me to an interesting publication on networks for knowledge sharing, produced by the Skat Foundation in Switzerland. The publication argues that:

The network paradigm is a seductive vision to solve all ... ills in one go: why not connect the North with the South and cross-connect all the involved actors with networks? With such linkages, activities could be coordinated, knowledge could be shared between North and South as well as within and among the countries of the South, best practices could be exchanged, and common standards and procedures developed. Many have succumbed to this alluring vision and countless networks exist in the development sector.

Have these networks really achieved their objectives? The results are inconclusive. While some networks attain considerable impact in their sectors, others have been more bureaucratic institutions, pushed by considerable donor funding. Some are quite dynamic, others static. All networks require a big effort from all parties involved and are often suspected of being excessively expensive. What can we learn from existing international networks for knowledge sharing?
http://www.skat-foundation.org/publications/pdf/ks-network-summary.pdf